Custom workflow for non-standard OAuth2

[qiangxinglin]

Is your feature request related to a problem? Please describe.
For DingTalk, it does not follow the standard OAuth2 protocol.
Specifically, the parameters used to get access_token is send in camelCase rather than snake_case. So currently, I cannot set it up without modifying the source code. Or maybe there exist other solutions?

Describe the solution you'd like
We could add concepts like property / field mapping or request interceptor for the non-standard OAuth2 protocol implementations.

Describe alternatives you've considered
Ory Kratos has something similar.

Additional context
No